Loop-taker-actuating mechanism for sewing-machines.



J. S. FINCH.

LOOP TAKER ACIUATING MECHANISM FOR SEWING MACHINES.

Patented July 3, 1917.

N am 2 Y A M D E L H N o H A c u DI DI A 2 SHEETS-SHEH' l- INVENTOR ATTORNEY APPLICATION FILED MAY 23, 191 6.

Patented July 3, 1917.

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Ill/VENTOR J 80 J I BY WITNESSES.

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JOHN S. FENCE, OF BRIDGEPOR'I', CONNECTICUT, ASSIGNOR TO THE- SINGER; MANUFAC- TUBING- COMPANY, A CORPORATION OF NEW JERSEY.

LOOP-TAKER-ACTUATING MECHANISM FOR SEWING-MACHINES.

I Specification of Letters Patent.

Patented ma a, torn Application filed May 23, 1916. Serial No. 99,280.

port, in the county of Fairficld and State of Connecticut, have invented certain new and useful- Improvements in Loop-Taker-Actuating Mechanim for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention. relates to that class of sewing machines employing a needle-carrying bar having movements in diflerent vertical planes and lateral movements of varying amplitude for efiecting embroidery seams and designs comprising zigzag stitches, and has for its object to provide improved means for retarding and accelerating the movements of the loop-taker to meet the requirements of variations in the lateral movement of the needle.

lln the accompanying drawings, which form a part of the specifications, Figure 1 is asectional view in front sideelevation of a sewing machine equipped with the present invention. Fig. 2 is an under side view of the sewing machine represented in Fig. 1. Fig. 3 is a View illustrating certain parts comprising the means for manually controlling the changes in amplitude ofthe lateral movements of the needle. Fig. 4 is a view, in perspective, of the front end portion of the loop-taker driving shaft and the gear member carried by the latter. Fig. 5 is a view in central section of the means employed for controlling the degree of lateral movement given the needle. Fig. 6 is a view, partly in full and partly in dotted lines, of certain of the elements shown in Fi 5, later to be referred to.

fieferring to the figures, 1 represents the bed-plate of the sewing machine upon which is mounted the bracket-arm comprising the arm bracket 2 and standard 3, 4: the main or needle-bar driving shaft provided at one end with the band-wheel 5 and at its opposite end with the shaft-flange 6 to which is pivotally connected the needle-bar actuating link 7 connected with the needle-bar 8 carrying the needle 9 and 10 the clothpresser suitably secured to the lower end of one form of commonly employed spring depressed cloth-presser carrying bar (not shown), the needle-bar 8 being mounted to move vertically in the needle-bar carrying frame 11 pivoted at its upper end on a studbolt 12 threaded into the arm-bracket 2.

13 represents the feed rock-shaft mounted in suitable bearings depending from the under side of the bed-plate and at its forward end operatively connected with the feed-dog carrying bracket 14 provided with the usual feed-dog 15, the opposite end of said shaft being connected by a crank-arm 16 with the feed connection 17, the upper end of the latter embracing the usual feed connection eccentric (not shown) carried by the main-shaft, thus transmitting from the latter feed movements to the feed-dog.

18 represents the feed lift rock-shaft mounted in the manner of shaft 13 and carrying at its forward end a crank-arm 19 provided with a stud-screw 20 carrying a slide-block 21 which engages the slot 22 formed in the end 23of the bracket 14, the opposite end of said. feed lift rock-shaft being connected by a crank-arm 24: with a feed lift connection 25 the upper end of which embraces a feed lift eccentric 26 carried by the main-shaft, thus transmitting from the latter vertical movements tov the feed-dog.

27 represents a spiral gear carried by the main-shaft and meshing With a like gear 28 carried by the cam-shaft 29 mounted at one end in a bearing 30 formed: in the armbracket, and at its opposite end in a suitable bearing formed in an arm-bracket plate (not shown) common to the present construction. The gears 27 and 28 are of the ratio of two to one, thus giving to the camshaft one rotation to two rotations. of said main-shaft and on the cam-shaft is mounted a needle vibrating cam 31, later to be re ferred to.

32. represents an oscillating cam shaft.

mounted in a bearing 32, formed in the arm-bracket and carrying on its outer end a crank-arm 33 connected by a link '34: with the end of a rock-lever 35, the opposite end of which is connected with a rod 36 which partakes of vertical movements, at the will of the operator through a suitable knee-lever or treadle (not shown) and in opposition to the resiliency of the spring 37, the latter normally acting to hold the end 38 of the crank-arm 33 in contact with the stationary lug 39 forming part of the collar 40 secured on the hub 41 of the oscillating shaft bearing, or in position to hold the needle-bar againstlateral movements.

The inner end of the shaft 32 is provided with a groove 42 in which tracks a slideblock 43. mounted on the inner end of a stud 44 which passes through the needlecarrying frame connection 45 and through a shifting lever connection 46 and secured by a nut 47 and flange 48 against movement in the direction of its length, the connection 45 being forked to embrace the cam 31 and at its opposite end pivotally connected to the needle-bar carrying frame 11.

49 represents a loop-taker actuating shaft mounted in suitable bearings depending from the sewing machine bed-plate and at its forward end carrying'a sliding sleeve 50, held against lengthwise movement by the flange 51 and suitably secured collar 52, having a spiral groove 53 and a spiral gear member 54, said shaft being provided with a suitably secured spiral groove follower 55 which, in practice, tracks the groove 53, said gear member meshin with a like gear 56 se-' cured on the loop-ta er shaft 57, the latter being-mounted in the usual manner below said bed-plate and carrying a loop-taker 58, Upon the rear end of the shaft 49 is secured a .belt driven pulley 59 connected by'a belt 60 with a drivingjpulley 61 carried by themain-shaft, said belt driving and driven bearin pulleys'being of the ratio of two to one, thus giving to the loop-taker shaft two rotations to one of said main-shaft.

62.represents a sleeve loosely mounted on the shaft 49 and held against lengthwise movement on said shaft by suitably secured collars 63 and 64, said sleeve having formed integral with it a bearing hub 65' upon which is pivoted one end of the loop-taker actuating shaft link 66, the opposite end of said link being pivotally attached to the lower end of the loop-taker actuating shaft shifting lever 67 mounted 'to oscillate. on a stud 68 secured in thesta'nd'ard 3 and pivotally connected at its upper end with the shifting lever connection 46. whose opposite end is pivoted onto the stud 44;

From the foregoing itwill' be readily understood that provision is made for actuating the needle either in a given path, as

when effecting the ordinary-straightaway 6 seam, or injdiife rent paths, "as 'ewhen efi'ecting the so-termed zigzag seam, and that when effecting the latter scam the loop-taker actuating shaft will be given movements in the direction of its length from the cam 31 70 through the connection 45, 46, 67 66 and 62, thus causing the follower 55 to act on the groove 53 to, through the gear member 54, accelerate or retard the movements of the gear member 56 fast on the loop-taker shaft 7 5 57, dependent upon the direction of the lengthwise movements of the shaft 49.

Having thus set forth the nature of the invention, what claim herein is 1. In a' sewing machine, the combination with a fabric feeding and stitch-forming mechanism including a needle having stitchforming movements in different paths, a main-shaft from which said needle is actuated, a loop-taker shaft provided with a loop-taker and a gear member, and a looptaker actuating shaft operatively connected at one end with said main-shaft and at its opposite end provided with means, including a loosely mounted sleeve provided with a gear mem er meshing with the gear member carried by s'aid loop-taker shaft, for accelerating and retarding the movements of said-loop-taker to maintain a proper timing of the latter with respect to the movements of said needle.

2. In a sewing machine, the combination with a fabric feeding and stitch-forming mechanism including a needle having stitchforming movements in different paths, a main-shaft from which said needle is actuated, a loop-taker shaft provided with a loop-taker and a gear member, and an endwise'movable loop-taker actuating shaft provided with a follower and operatively connected at one end with said main-shaft and at its opposite'end carrying a loosely mounted sleeve provided with a gear member meshing with the gear member carried by said loop-taker shaft and having an internal spiral groovecooperating with said follower to accelerate and retard, through the endwise movements of said=loop-taker actuating shaft, the movements of said loop-taker tomaintain a proper timing of the latter-with member carried. by said loop-taker shaft and name to this specification, in the presence of having an internal spiral groove cooperating two subscribing witnesses.

with said follower to accelerate and retard the movements of said loop-taker to main- JOHN FINOH' 5 tain a proper timing of the latter with. re- Witnesses:

spect to the movement of said needle. STANLEY N. SMITH,

In testimony whereof, I have signed; my WM. A. SAUTTER. 

